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《材料导报》2004,18(Z3)
本研究計書之目的,系探討沃斯田鐵面心立方結構之鐵-9鋁-30錳-1碳-0.5矽合金,雨種試様時效热處理后内部微析出物顯微結構與超順磁性質之關系,雨種試様分别爲固溶油冷與固溶油冷鍛應變20%~50%,再同時於823K持温140天時效處理.本研究結果顯示:此種合金固溶油冷經冷鍛應變再時效析出處理,可以顯著地改善此種合金内部微結構磁性相析出物之導磁率與館和磁化强度,其原因系歸因於沃斯田鐵相面心立方結構之鐵鋁錳碳合金,固溶處理,再經20%~50%之冷鍛加工應變(變形)后,則在{111}八面體原子最密集結晶面之〈1 10〉原子最密集向量上,會引生叠差與可動差排密度量之增加,進而在沃斯田鐵基地内部,增加叠差能與差排之相互作用,并促成差排核心鐵/錳-碳偶合(Fe/Mn-C coupks)的碳原子重新取向,所以應變與時效析出處理,能提升此種材料内部差排和其相關溶質原子之擴散與物理化學反應,進而提升時效處理后,合金内部之微結構磁性相析出物在非磁性基地的時效析出效果,并改善時效處理后,試様内部之微結構磁性相析出物之導磁率與館和磁化强度.X-ray繞射實驗與穿透式電子顯微鏡(TEM)研究證實:微結構磁性相析出物系源自於層状κ-相的相變能反應所産生之産物,而微結構磁性相析出物(B2 D03)與κ-相之結晶方向關系爲[1 12](B2 D03)∥[133]k;[300](B2 D03)∥[400](B2 D03)∥[011]k,及微結構磁性相析出物α'-Mn與B2之結晶方向關系爲[001]α'-Mn∥[123]B2. 相似文献
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本研究計()之目的,系探討沃斯田鐵面心立方結構之鐵-9鋁-30 錳-1碳-0.5矽合金,兩種試樣時效熱處理后内部微析出物顯微結構與超順磁性質之關系,兩種試樣分别爲固溶油冷與固溶油冷鍛應變20%~50%,再同時於823K持温140天時效處理.本研究結果顯示:此種合金固溶油冷經冷鍛應變再時效析出處理,可以顯著地改善此種合金内部微結構磁性相析出物之導磁率與饱和磁化强度,其原因系歸因於沃斯田鐵相面心立方結構之鐵鋁錳碳合金,固溶處理,再經20%~50%之冷鍛加工應變(變形)后,則在{111}八面體原子最密集結晶面之<110>原子最密集向量上,會引生叠差與可動差排密度量之增加,進而在沃斯田鐵基地内部,增加叠差能與差排之相互作用,并促成差排核心鐵/錳-碳偶合(Fe/Mn-C couples)的碳原子重新取向,所以應變與時效析出處理,能提升此種材料内部差排和其相關溶質原子之擴散與物理化學反應,進而提升時效處理后,合金内部之微結構磁性相析出物在非磁性基地的時效析出效果,并改善時效處理后,試樣内部之微結構磁性相析出物之導磁率與饱和磁化强度.X-ray繞射實難與穿透式電子顯微鏡(TEM)研究證實:微結構磁性相析出物系源自於層狀κ-相的相變能反應所産生之産物,而微結構磁性相析出物(B2 D03)與κ-相之結晶方向關系爲[1 ̄12](B2 D03)∥[ ̄133]k;[ ̄300](B2 D03)∥[ ̄400](B2 D03)∥[011]κ,及微結構磁性相析出物α′-Mn與B2之結晶方向關系爲[001]α′-Mn∥[123]B2. 相似文献
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Censi R Martena V Hoti E Malaj L Di Martino P 《Drug development and industrial pharmacy》2012,38(9):1128-1133
A microemulsion for the cutaneous release of quercetin was prepared. An aqueous phase, containing 40% Transcutol(?) P as solubilizing agent and permeation enhancer, was emulsified with Labrafil(?) as oil phase and Labrasol(?)/Capryol(?) 90 as Solvent/Co-solvent. Quercetin was dissolved in the microemulsion at the concentration of 1%. Ternary phase diagrams were generated to determine the optimal concentration of each excipient composing the microemulsion. The physicochemical properties of the microemulsion, such as pH, viscosity, refractive index, and particle size distribution were determined. The microemulsion was stable for 12 months at the storing conditions of 25.0 ± 1.0°C. The in vitro quercetin permeability into and through the abdominal hairless pig skin was determined by vertical Franz's cells. Quercetin showed hardly any permeability through the skin when dissolved in water- and Transcutol(?) P-free media, whereas a remarkable increase in cutaneous permeability was observed when quercetin was formulated in the microemulsion or when simply dissolved in Transcutol(?) P. These two last formulations are those showing the lower skin retention. 相似文献
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K. Hackl W. Zhang M. Schmidt‐Baldassari U. Hoppe 《Materialwissenschaft und Werkstofftechnik》2004,35(5):284-288
The asymmetry associated with martensitic transformations observed in tension/compression experiments of shape‐memory‐alloys (SMAs) is investigated on the basis of a recently suggested micromechanical model. The approach is based on crystallographic theory and utilizes a framework of energy minimization in a finite deformation context. Polycrystalline NiTi under tension demonstrates smaller phase‐transformation start‐strain, differe phase‐transformation stress‐levels and flatter phase‐transformation stress‐strain slopes than that under compression in our numerical simulation. The phase‐transformation start‐stress is followed to have a linear relationship with respect to the temperature within a certain range. These results agree well with experimental results reported in the literature. 相似文献
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饱和砂土基于相变状态的改进本构模型能较好地描述砂土不排水情况下的应力-应变关系。通过改进模型中相变状态参量的计算方法,将e-lgp°表达式加以改进,通过详细的阐述,提出ept-lgp的关系式,并通过三轴压缩试验的数据对提出的关系式加以验证。应用新的关系式计算不排水条件下试样的相变孔隙比ept,进而计算出模型中的相变状态参量。改进后的不排水本构模型的计算结果与不排水三轴压缩的试验结果能较好地吻合,即验证了本构模型的有效性,也验证了ept-lgp关系式的合理性,使原有的边界面本构模型更好地描述不排水的情况下、不同密度和围压状态下饱和砂土的力学行为。 相似文献